SU1283970A1 - Converter of a.c.balanced modulated signals to digital code - Google Patents

Abstract

The invention relates to the field of automation and computing and can be used to connect analog information sources with a digital computing device. In order to simplify the converter by reducing the number of analog-digital multipliers, the converter containing the first and second analog-digital multipliers, the first adder, the amplifier, the phase-sensitive rectifier, the frequency controller, the reversible counter and the code B conversion unit, the cosine and sine codes, introduced the second and third adders. The input balanced modulated signals of the converter are summed with each other in the second and third analog adders with weight coefficients proportional to the cosine dependence for the second adder and the sinus dependence for the third adder. At the outputs of the second and third adders, alternating current signals are generated, modulated by the Sine and cosine functions, respectively, which in analog-digital multipliers are multiplied by the cosine and sine codes of the output code N of the converter. At the output of the first adder, an alternating current signal is generated, the amplitude of which is proportional to the error between the parameter oL and its code equivalent N. The code N of the reversible counter changes to eliminate the error between ot and N. 1 hp f-ly, 2 ill. WITH

Description

The invention relates to automation and computing and can be used to communicate analog information sources with a digital computing device.

. The purpose of the invention is to simplify the converter by reducing the number of analog-digital multipliers, J Fig. 1 shows a block diagram of the converter; Fig. 2 shows a block diagram of a block for converting code to cosine and sine codes.

The converter of balanced-modulated signals of alternating current to the code (FN.1) contains the first I and 15 second 2 analog-digital multipliers, the first adder 3, amplifier 4, phase-sensitive rectifier 5, frequency regulator 6, reversible counter 7j, code conversion block 8 to cosine and sine codes 20, second 9 and third 10 adders.

The code conversion block 8 into cosine and sine codes (Fig. 2) contains a memory block 11, first 12 and second 13 25 registers, first 14 and second 15 modulo-two adders, first 16 and second 17 And elements, and OR 18 element , inverter 19, the generator 20 pulses.

digital multipliers 1 and 2 respectively. In the adder 3, the voltage U of the difference of the output signals of the analog-digital multipliers 1 and 2 is formed.

TO

and, and sin (oL-N).

.3 p 2

In the phase-sensitive straightener, a constant

from signal U

depending on the amplitude and sign of which, the regulator 6 generates pulses of a certain frequency on one of the outputs. The code N in the reversible counter 7 is changed to eliminate the mismatch between (and N.

Claims (2)

1. Converter of balanced-modulated signals of alternating current into a code containing the first and second analog-digital multipliers, the digital inputs of which are connected respectively to the first and second groups of outputs of the code conversion unit to cosine and sine codes, and the outputs are connected to the inputs of the first adder, the output of the first adder through The converter operates with the following 30 amplifier connected to one input digital multipliers 1 and 2 respectively. In the adder 3, the voltage U of the difference of the output signals of the analog-digital multipliers 1 and 2 is formed. TO and, and sin (oL-N). .3 p 2 In the phase-sensitive straightener, a constant from signal U component, depending on the amplitude and sign of which the controller 6 produces pulses of a certain frequency on one of the outputs. The code N in the reversible counter 7 is changed to eliminate the mismatch between (and N. Invention Formula 1. Converter of balanced-modulated signals of alternating current into a code containing the first and second analog-digital multipliers, the digital inputs of which are connected respectively to the first and second groups of outputs of the code conversion unit to cosine and sine codes, and the outputs are connected to the inputs of the first adder, the output of the first adder through in a way. To the input of the converter enters To balanced-modulated signals of alternating current type U; U sin dl + | - (i-l), where, 2 .... K is the signal number; 4fU ,,. SiniOt is the reference voltage. P gt | The adder 9 performs the summation of the input signals of the converter with the weighting factors 23G, , cos-ti-t) for every 1st channel k. respectively. In the adder 10, the input signals of the converter are summed with the weighting factors. . 2J ,. . 81ГЦг - (. 1-1) FOR each 1st channel. Signals are formed at the output of adders 9 and 10 U9 U 2sinol, and, and „coso1, which are fed to the analog input analog-digital multipliers 1 and 2, respectively. In block 8, codes proportional to cosN and sinN are generated from the N code of the reversible counter 7, which are fed to the digital inputs of the analog phase-sensitive rectifier, the other input of which is connected to the reference voltage source, and the output is connected to the input of the frequency regulator, 5, the outputs of the frequency controller are connected to the inputs of the addition and subtraction of a reversible counter, respectively, the outputs of the bits of the reversible counter are the outputs of the converter and 0 are connected to the inputs of the code conversion unit to the cosine and sine codes, characterized in that, in order to simplify the converter, the second and third summers are entered into it, the inputs of which are the converter inputs, and the outputs are connected to the analog inputs of the first and the second analog-digital multipliers, respectively, with the transmission coefficients of the second and third adders selected in accordance with 2li ,. , i with cosine cosr (i-l) and sine k. . 23t. , sin .- (. 1-1) dependencies, where. 1 5 - k (1,2 ... k) is the number of the input of the adder, k is the number of inputs of the converter. 2. The converter according to claim 1, characterized in that the block Converting code into cosine and sine codes contains a memory block, the first and second registers, the first and second modulators two, the first and second AND elements, the OR element, the inverter, a pulse generator, the first and second inputs of the first modulo-two adder, and a group the inputs of the memory block are the inputs of the code conversion block to the cosine and sine codes, the outputs of the memory block are connected to the information inputs of the first and second registers, the outputs of which are respectively the first and second groups of outputs of the code conversion block cosine and sine codes, the output of the pulse generator is connected to the control input of the second register and to one input of the first element And the second adder modulo two, and through the inverter - to the control input of the first register and to one input of the second element And, the first and second inputs of the first soo :: modulo two are connected to the other inputs correspondingly, the second element And the second, modulo two, the output of the first modulo two is connected to another input of the first element, And the outputs of the first and second elements AND through the OR element are connected to the first input of the memory block, and the output of the second. Modulo two connected to the second input of the memory unit.